clang format, similar to GNU Radio
This commit is contained in:
Bastian Bloessl
@@ -56,280 +56,300 @@
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* would spill over into memory.
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*/
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#define BUTTERFLY(i,sym) { \
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int m0,m1,m2,m3; \
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/* ACS for 0 branch */ \
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m0 = state[i].metric + mets[sym]; /* 2*i */ \
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m1 = state[i+32].metric + mets[3 ^ sym]; /* 2*i + 64 */ \
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if(m0 > m1){ \
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next[2*i].metric = m0; \
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next[2*i].path = state[i].path << 1; \
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} else { \
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next[2*i].metric = m1; \
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next[2*i].path = (state[i+32].path << 1)|1; \
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} \
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/* ACS for 1 branch */ \
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m2 = state[i].metric + mets[3 ^ sym]; /* 2*i + 1 */ \
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m3 = state[i+32].metric + mets[sym]; /* 2*i + 65 */ \
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if(m2 > m3){ \
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next[2*i+1].metric = m2; \
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next[2*i+1].path = state[i].path << 1; \
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} else { \
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next[2*i+1].metric = m3; \
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next[2*i+1].path = (state[i+32].path << 1)|1; \
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} \
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}
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#define BUTTERFLY(i, sym) \
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{ \
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int m0, m1, m2, m3; \
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/* ACS for 0 branch */ \
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m0 = state[i].metric + mets[sym]; /* 2*i */ \
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m1 = state[i + 32].metric + mets[3 ^ sym]; /* 2*i + 64 */ \
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if (m0 > m1) { \
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next[2 * i].metric = m0; \
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next[2 * i].path = state[i].path << 1; \
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} else { \
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next[2 * i].metric = m1; \
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next[2 * i].path = (state[i + 32].path << 1) | 1; \
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} \
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/* ACS for 1 branch */ \
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m2 = state[i].metric + mets[3 ^ sym]; /* 2*i + 1 */ \
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m3 = state[i + 32].metric + mets[sym]; /* 2*i + 65 */ \
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if (m2 > m3) { \
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next[2 * i + 1].metric = m2; \
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next[2 * i + 1].path = state[i].path << 1; \
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} else { \
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next[2 * i + 1].metric = m3; \
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next[2 * i + 1].path = (state[i + 32].path << 1) | 1; \
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} \
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}
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using namespace gr::ieee802_11;
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void
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viterbi_decoder::viterbi_butterfly2_sse2(unsigned char *symbols,
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__m128i *mm0, __m128i *mm1, __m128i *pp0, __m128i *pp1) {
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int i;
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void viterbi_decoder::viterbi_butterfly2_sse2(
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unsigned char* symbols, __m128i* mm0, __m128i* mm1, __m128i* pp0, __m128i* pp1)
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{
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int i;
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__m128i *metric0, *metric1;
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__m128i *path0, *path1;
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__m128i *metric0, *metric1;
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__m128i *path0, *path1;
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metric0 = mm0;
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path0 = pp0;
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metric1 = mm1;
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path1 = pp1;
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metric0 = mm0;
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path0 = pp0;
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metric1 = mm1;
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path1 = pp1;
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// Operate on 4 symbols (2 bits) at a time
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// Operate on 4 symbols (2 bits) at a time
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__m128i m0, m1, m2, m3, decision0, decision1, survivor0, survivor1;
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__m128i metsv, metsvm;
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__m128i shift0, shift1;
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__m128i tmp0, tmp1;
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__m128i sym0v, sym1v;
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__m128i m0, m1, m2, m3, decision0, decision1, survivor0, survivor1;
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__m128i metsv, metsvm;
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__m128i shift0, shift1;
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__m128i tmp0, tmp1;
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__m128i sym0v, sym1v;
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sym0v = _mm_set1_epi8(symbols[0]);
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sym1v = _mm_set1_epi8(symbols[1]);
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sym0v = _mm_set1_epi8(symbols[0]);
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sym1v = _mm_set1_epi8(symbols[1]);
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for (i = 0; i < 2; i++) {
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if (symbols[0] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[1].v[i],sym1v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1),metsvm);
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} else if (symbols[1] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[0].v[i],sym0v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1),metsvm);
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} else {
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metsvm = _mm_add_epi8(_mm_xor_si128(d_branchtab27_sse2[0].v[i],sym0v),_mm_xor_si128(d_branchtab27_sse2[1].v[i],sym1v));
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metsv = _mm_sub_epi8(_mm_set1_epi8(2),metsvm);
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}
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for (i = 0; i < 2; i++) {
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if (symbols[0] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[1].v[i], sym1v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1), metsvm);
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} else if (symbols[1] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[0].v[i], sym0v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1), metsvm);
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} else {
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metsvm = _mm_add_epi8(_mm_xor_si128(d_branchtab27_sse2[0].v[i], sym0v),
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_mm_xor_si128(d_branchtab27_sse2[1].v[i], sym1v));
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metsv = _mm_sub_epi8(_mm_set1_epi8(2), metsvm);
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}
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m0 = _mm_add_epi8(metric0[i], metsv);
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m1 = _mm_add_epi8(metric0[i+2], metsvm);
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m2 = _mm_add_epi8(metric0[i], metsvm);
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m3 = _mm_add_epi8(metric0[i+2], metsv);
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m0 = _mm_add_epi8(metric0[i], metsv);
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m1 = _mm_add_epi8(metric0[i + 2], metsvm);
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m2 = _mm_add_epi8(metric0[i], metsvm);
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m3 = _mm_add_epi8(metric0[i + 2], metsv);
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decision0 = _mm_cmpgt_epi8(_mm_sub_epi8(m0,m1),_mm_setzero_si128());
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decision1 = _mm_cmpgt_epi8(_mm_sub_epi8(m2,m3),_mm_setzero_si128());
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survivor0 = _mm_or_si128(_mm_and_si128(decision0,m0),_mm_andnot_si128(decision0,m1));
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survivor1 = _mm_or_si128(_mm_and_si128(decision1,m2),_mm_andnot_si128(decision1,m3));
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decision0 = _mm_cmpgt_epi8(_mm_sub_epi8(m0, m1), _mm_setzero_si128());
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decision1 = _mm_cmpgt_epi8(_mm_sub_epi8(m2, m3), _mm_setzero_si128());
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survivor0 =
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_mm_or_si128(_mm_and_si128(decision0, m0), _mm_andnot_si128(decision0, m1));
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survivor1 =
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_mm_or_si128(_mm_and_si128(decision1, m2), _mm_andnot_si128(decision1, m3));
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shift0 = _mm_slli_epi16(path0[i], 1);
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shift1 = _mm_slli_epi16(path0[2+i], 1);
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shift1 = _mm_add_epi8(shift1, _mm_set1_epi8(1));
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shift0 = _mm_slli_epi16(path0[i], 1);
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shift1 = _mm_slli_epi16(path0[2 + i], 1);
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shift1 = _mm_add_epi8(shift1, _mm_set1_epi8(1));
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metric1[2*i] = _mm_unpacklo_epi8(survivor0,survivor1);
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tmp0 = _mm_or_si128(_mm_and_si128(decision0,shift0),_mm_andnot_si128(decision0,shift1));
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metric1[2 * i] = _mm_unpacklo_epi8(survivor0, survivor1);
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tmp0 = _mm_or_si128(_mm_and_si128(decision0, shift0),
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_mm_andnot_si128(decision0, shift1));
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metric1[2*i+1] = _mm_unpackhi_epi8(survivor0,survivor1);
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tmp1 = _mm_or_si128(_mm_and_si128(decision1,shift0),_mm_andnot_si128(decision1,shift1));
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metric1[2 * i + 1] = _mm_unpackhi_epi8(survivor0, survivor1);
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tmp1 = _mm_or_si128(_mm_and_si128(decision1, shift0),
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_mm_andnot_si128(decision1, shift1));
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path1[2*i] = _mm_unpacklo_epi8(tmp0, tmp1);
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path1[2*i+1] = _mm_unpackhi_epi8(tmp0, tmp1);
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}
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path1[2 * i] = _mm_unpacklo_epi8(tmp0, tmp1);
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path1[2 * i + 1] = _mm_unpackhi_epi8(tmp0, tmp1);
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}
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metric0 = mm1;
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path0 = pp1;
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metric1 = mm0;
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path1 = pp0;
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metric0 = mm1;
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path0 = pp1;
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metric1 = mm0;
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path1 = pp0;
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sym0v = _mm_set1_epi8(symbols[2]);
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sym1v = _mm_set1_epi8(symbols[3]);
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sym0v = _mm_set1_epi8(symbols[2]);
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sym1v = _mm_set1_epi8(symbols[3]);
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for (i = 0; i < 2; i++) {
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if (symbols[2] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[1].v[i],sym1v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1),metsvm);
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for (i = 0; i < 2; i++) {
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if (symbols[2] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[1].v[i], sym1v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1), metsvm);
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} else if (symbols[3] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[0].v[i],sym0v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1),metsvm);
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} else if (symbols[3] == 2) {
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metsvm = _mm_xor_si128(d_branchtab27_sse2[0].v[i], sym0v);
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metsv = _mm_sub_epi8(_mm_set1_epi8(1), metsvm);
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} else {
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metsvm = _mm_add_epi8(_mm_xor_si128(d_branchtab27_sse2[0].v[i],sym0v),_mm_xor_si128(d_branchtab27_sse2[1].v[i],sym1v));
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metsv = _mm_sub_epi8(_mm_set1_epi8(2),metsvm);
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}
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} else {
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metsvm = _mm_add_epi8(_mm_xor_si128(d_branchtab27_sse2[0].v[i], sym0v),
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_mm_xor_si128(d_branchtab27_sse2[1].v[i], sym1v));
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metsv = _mm_sub_epi8(_mm_set1_epi8(2), metsvm);
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}
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m0 = _mm_add_epi8(metric0[i], metsv);
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m1 = _mm_add_epi8(metric0[i+2], metsvm);
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m2 = _mm_add_epi8(metric0[i], metsvm);
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m3 = _mm_add_epi8(metric0[i+2], metsv);
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m0 = _mm_add_epi8(metric0[i], metsv);
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m1 = _mm_add_epi8(metric0[i + 2], metsvm);
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m2 = _mm_add_epi8(metric0[i], metsvm);
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m3 = _mm_add_epi8(metric0[i + 2], metsv);
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decision0 = _mm_cmpgt_epi8(_mm_sub_epi8(m0,m1),_mm_setzero_si128());
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decision1 = _mm_cmpgt_epi8(_mm_sub_epi8(m2,m3),_mm_setzero_si128());
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survivor0 = _mm_or_si128(_mm_and_si128(decision0,m0),_mm_andnot_si128(decision0,m1));
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survivor1 = _mm_or_si128(_mm_and_si128(decision1,m2),_mm_andnot_si128(decision1,m3));
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decision0 = _mm_cmpgt_epi8(_mm_sub_epi8(m0, m1), _mm_setzero_si128());
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decision1 = _mm_cmpgt_epi8(_mm_sub_epi8(m2, m3), _mm_setzero_si128());
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survivor0 =
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_mm_or_si128(_mm_and_si128(decision0, m0), _mm_andnot_si128(decision0, m1));
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survivor1 =
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_mm_or_si128(_mm_and_si128(decision1, m2), _mm_andnot_si128(decision1, m3));
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shift0 = _mm_slli_epi16(path0[i], 1);
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shift1 = _mm_slli_epi16(path0[2+i], 1);
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shift1 = _mm_add_epi8(shift1, _mm_set1_epi8(1));
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shift0 = _mm_slli_epi16(path0[i], 1);
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shift1 = _mm_slli_epi16(path0[2 + i], 1);
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shift1 = _mm_add_epi8(shift1, _mm_set1_epi8(1));
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metric1[2*i] = _mm_unpacklo_epi8(survivor0,survivor1);
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tmp0 = _mm_or_si128(_mm_and_si128(decision0,shift0),_mm_andnot_si128(decision0,shift1));
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metric1[2 * i] = _mm_unpacklo_epi8(survivor0, survivor1);
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tmp0 = _mm_or_si128(_mm_and_si128(decision0, shift0),
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_mm_andnot_si128(decision0, shift1));
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metric1[2*i+1] = _mm_unpackhi_epi8(survivor0,survivor1);
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tmp1 = _mm_or_si128(_mm_and_si128(decision1,shift0),_mm_andnot_si128(decision1,shift1));
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metric1[2 * i + 1] = _mm_unpackhi_epi8(survivor0, survivor1);
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tmp1 = _mm_or_si128(_mm_and_si128(decision1, shift0),
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_mm_andnot_si128(decision1, shift1));
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path1[2*i] = _mm_unpacklo_epi8(tmp0, tmp1);
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path1[2*i+1] = _mm_unpackhi_epi8(tmp0, tmp1);
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}
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path1[2 * i] = _mm_unpacklo_epi8(tmp0, tmp1);
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path1[2 * i + 1] = _mm_unpackhi_epi8(tmp0, tmp1);
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}
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}
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// Find current best path
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unsigned char
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viterbi_decoder::viterbi_get_output_sse2(__m128i *mm0, __m128i *pp0,
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int ntraceback, unsigned char *outbuf) {
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int i;
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int bestmetric, minmetric;
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int beststate = 0;
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int pos = 0;
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unsigned char viterbi_decoder::viterbi_get_output_sse2(__m128i* mm0,
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__m128i* pp0,
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int ntraceback,
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unsigned char* outbuf)
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{
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int i;
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int bestmetric, minmetric;
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int beststate = 0;
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int pos = 0;
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// circular buffer with the last ntraceback paths
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d_store_pos = (d_store_pos + 1) % ntraceback;
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// circular buffer with the last ntraceback paths
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d_store_pos = (d_store_pos + 1) % ntraceback;
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for (i = 0; i < 4; i++) {
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_mm_store_si128((__m128i *) &d_mmresult[i*16], mm0[i]);
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_mm_store_si128((__m128i *) &d_ppresult[d_store_pos][i*16], pp0[i]);
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}
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for (i = 0; i < 4; i++) {
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_mm_store_si128((__m128i*)&d_mmresult[i * 16], mm0[i]);
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_mm_store_si128((__m128i*)&d_ppresult[d_store_pos][i * 16], pp0[i]);
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}
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// Find out the best final state
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bestmetric = d_mmresult[beststate];
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minmetric = d_mmresult[beststate];
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// Find out the best final state
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bestmetric = d_mmresult[beststate];
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minmetric = d_mmresult[beststate];
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for (i = 1; i < 64; i++) {
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if (d_mmresult[i] > bestmetric) {
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bestmetric = d_mmresult[i];
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beststate = i;
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}
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if (d_mmresult[i] < minmetric) {
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minmetric = d_mmresult[i];
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}
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}
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for (i = 1; i < 64; i++) {
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if (d_mmresult[i] > bestmetric) {
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bestmetric = d_mmresult[i];
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beststate = i;
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}
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if (d_mmresult[i] < minmetric) {
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minmetric = d_mmresult[i];
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}
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}
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// Trace back
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for (i = 0, pos = d_store_pos; i < (ntraceback - 1); i++) {
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// Obtain the state from the output bits
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// by clocking in the output bits in reverse order.
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// The state has only 6 bits
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beststate = d_ppresult[pos][beststate] >> 2;
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pos = (pos - 1 + ntraceback) % ntraceback;
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}
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// Trace back
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for (i = 0, pos = d_store_pos; i < (ntraceback - 1); i++) {
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// Obtain the state from the output bits
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// by clocking in the output bits in reverse order.
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// The state has only 6 bits
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beststate = d_ppresult[pos][beststate] >> 2;
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pos = (pos - 1 + ntraceback) % ntraceback;
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}
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// Store output byte
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*outbuf = d_ppresult[pos][beststate];
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// Store output byte
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*outbuf = d_ppresult[pos][beststate];
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// Zero out the path variable
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// and prevent metric overflow
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for (i = 0; i < 4; i++) {
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pp0[i] = _mm_setzero_si128();
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mm0[i] = _mm_sub_epi8(mm0[i], _mm_set1_epi8(minmetric));
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}
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// Zero out the path variable
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// and prevent metric overflow
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for (i = 0; i < 4; i++) {
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pp0[i] = _mm_setzero_si128();
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mm0[i] = _mm_sub_epi8(mm0[i], _mm_set1_epi8(minmetric));
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}
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return bestmetric;
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return bestmetric;
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}
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uint8_t*
|
||||
viterbi_decoder::decode(ofdm_param *ofdm, frame_param *frame, uint8_t *in) {
|
||||
uint8_t* viterbi_decoder::decode(ofdm_param* ofdm, frame_param* frame, uint8_t* in)
|
||||
{
|
||||
|
||||
d_ofdm = ofdm;
|
||||
d_frame = frame;
|
||||
d_ofdm = ofdm;
|
||||
d_frame = frame;
|
||||
|
||||
reset();
|
||||
uint8_t *depunctured = depuncture(in);
|
||||
reset();
|
||||
uint8_t* depunctured = depuncture(in);
|
||||
|
||||
int in_count = 0;
|
||||
int out_count = 0;
|
||||
int n_decoded = 0;
|
||||
int in_count = 0;
|
||||
int out_count = 0;
|
||||
int n_decoded = 0;
|
||||
|
||||
while(n_decoded < d_frame->n_data_bits) {
|
||||
while (n_decoded < d_frame->n_data_bits) {
|
||||
|
||||
if ((in_count % 4) == 0) { //0 or 3
|
||||
viterbi_butterfly2_sse2(&depunctured[in_count & 0xfffffffc], d_metric0, d_metric1, d_path0, d_path1);
|
||||
if ((in_count % 4) == 0) { // 0 or 3
|
||||
viterbi_butterfly2_sse2(&depunctured[in_count & 0xfffffffc],
|
||||
d_metric0,
|
||||
d_metric1,
|
||||
d_path0,
|
||||
d_path1);
|
||||
|
||||
if ((in_count > 0) && (in_count % 16) == 8) { // 8 or 11
|
||||
unsigned char c;
|
||||
if ((in_count > 0) && (in_count % 16) == 8) { // 8 or 11
|
||||
unsigned char c;
|
||||
|
||||
viterbi_get_output_sse2(d_metric0, d_path0, d_ntraceback, &c);
|
||||
viterbi_get_output_sse2(d_metric0, d_path0, d_ntraceback, &c);
|
||||
|
||||
if (out_count >= d_ntraceback) {
|
||||
for (int i= 0; i < 8; i++) {
|
||||
d_decoded[(out_count - d_ntraceback) * 8 + i] = (c >> (7 - i)) & 0x1;
|
||||
n_decoded++;
|
||||
}
|
||||
}
|
||||
out_count++;
|
||||
}
|
||||
}
|
||||
in_count++;
|
||||
}
|
||||
if (out_count >= d_ntraceback) {
|
||||
for (int i = 0; i < 8; i++) {
|
||||
d_decoded[(out_count - d_ntraceback) * 8 + i] =
|
||||
(c >> (7 - i)) & 0x1;
|
||||
n_decoded++;
|
||||
}
|
||||
}
|
||||
out_count++;
|
||||
}
|
||||
}
|
||||
in_count++;
|
||||
}
|
||||
|
||||
return d_decoded;
|
||||
return d_decoded;
|
||||
}
|
||||
|
||||
void
|
||||
viterbi_decoder::reset() {
|
||||
void viterbi_decoder::reset()
|
||||
{
|
||||
|
||||
viterbi_chunks_init_sse2();
|
||||
viterbi_chunks_init_sse2();
|
||||
|
||||
switch(d_ofdm->encoding) {
|
||||
case BPSK_1_2:
|
||||
case QPSK_1_2:
|
||||
case QAM16_1_2:
|
||||
d_ntraceback = 5;
|
||||
d_depuncture_pattern = PUNCTURE_1_2;
|
||||
d_k = 1;
|
||||
break;
|
||||
case QAM64_2_3:
|
||||
d_ntraceback = 9;
|
||||
d_depuncture_pattern = PUNCTURE_2_3;
|
||||
d_k = 2;
|
||||
break;
|
||||
case BPSK_3_4:
|
||||
case QPSK_3_4:
|
||||
case QAM16_3_4:
|
||||
case QAM64_3_4:
|
||||
d_ntraceback = 10;
|
||||
d_depuncture_pattern = PUNCTURE_3_4;
|
||||
d_k = 3;
|
||||
break;
|
||||
}
|
||||
switch (d_ofdm->encoding) {
|
||||
case BPSK_1_2:
|
||||
case QPSK_1_2:
|
||||
case QAM16_1_2:
|
||||
d_ntraceback = 5;
|
||||
d_depuncture_pattern = PUNCTURE_1_2;
|
||||
d_k = 1;
|
||||
break;
|
||||
case QAM64_2_3:
|
||||
d_ntraceback = 9;
|
||||
d_depuncture_pattern = PUNCTURE_2_3;
|
||||
d_k = 2;
|
||||
break;
|
||||
case BPSK_3_4:
|
||||
case QPSK_3_4:
|
||||
case QAM16_3_4:
|
||||
case QAM64_3_4:
|
||||
d_ntraceback = 10;
|
||||
d_depuncture_pattern = PUNCTURE_3_4;
|
||||
d_k = 3;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// Initialize starting metrics to prefer 0 state
|
||||
void
|
||||
viterbi_decoder::viterbi_chunks_init_sse2() {
|
||||
int i, j;
|
||||
void viterbi_decoder::viterbi_chunks_init_sse2()
|
||||
{
|
||||
int i, j;
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
d_metric0[i] = _mm_setzero_si128();
|
||||
d_path0[i] = _mm_setzero_si128();
|
||||
}
|
||||
for (i = 0; i < 4; i++) {
|
||||
d_metric0[i] = _mm_setzero_si128();
|
||||
d_path0[i] = _mm_setzero_si128();
|
||||
}
|
||||
|
||||
int polys[2] = { 0x6d, 0x4f };
|
||||
for(i=0; i < 32; i++) {
|
||||
d_branchtab27_sse2[0].c[i] = (polys[0] < 0) ^ PARTAB[(2*i) & abs(polys[0])] ? 1 : 0;
|
||||
d_branchtab27_sse2[1].c[i] = (polys[1] < 0) ^ PARTAB[(2*i) & abs(polys[1])] ? 1 : 0;
|
||||
}
|
||||
int polys[2] = { 0x6d, 0x4f };
|
||||
for (i = 0; i < 32; i++) {
|
||||
d_branchtab27_sse2[0].c[i] =
|
||||
(polys[0] < 0) ^ PARTAB[(2 * i) & abs(polys[0])] ? 1 : 0;
|
||||
d_branchtab27_sse2[1].c[i] =
|
||||
(polys[1] < 0) ^ PARTAB[(2 * i) & abs(polys[1])] ? 1 : 0;
|
||||
}
|
||||
|
||||
for (i = 0; i < 64; i++) {
|
||||
d_mmresult[i] = 0;
|
||||
for (j = 0; j < TRACEBACK_MAX; j++) {
|
||||
d_ppresult[j][i] = 0;
|
||||
}
|
||||
}
|
||||
for (i = 0; i < 64; i++) {
|
||||
d_mmresult[i] = 0;
|
||||
for (j = 0; j < TRACEBACK_MAX; j++) {
|
||||
d_ppresult[j][i] = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user